Cross-shell excitations near the 'Island of Inversion': structure of $^30Mg$

A.N. Deacon, J.F. Smith, S.J. Freeman, R.V.F. Janssens, M.P. Carpenter, B. Hadinia, C.R. Hoffman, B.P. Kay, T. Lauritsen, C.J. Lister, D. O'Donnell, J. Ollier, T. Otsuka, D. Seweryniak, K.M. Spohr, D. Steppenbeck, S.L. Tabor, V. Tripathi, Y. Utsuno, P.T. WadyS. Zhu

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Abstract

Excited states in 30Mg have been populated to ~6ℏ and 5 MeV excitation energy with the 14C(18O,2p) reaction. Firm spin assignments for states with J>2ℏ have been made in this nucleus. The level scheme is compared to shell-model calculations using the Universal sd effective interaction and the Monte Carlo shell model method. Calculations employing a full sd model space fail to reproduce the observed levels. The results indicate that excitations across the N=20 gap are required at relatively low excitation energy to achieve a description of the data. The incorporation of the f7/2 and p3/2 orbitals into the model space gives improved results but indicate the need for further refinement of the models to reproduce the observed spectra.
Original languageEnglish
Article number034305
JournalPhysical Review C
Volume82
Issue number3
DOIs
Publication statusPublished - 7 Sep 2010

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Deacon, A. N., Smith, J. F., Freeman, S. J., Janssens, R. V. F., Carpenter, M. P., Hadinia, B., Hoffman, C. R., Kay, B. P., Lauritsen, T., Lister, C. J., O'Donnell, D., Ollier, J., Otsuka, T., Seweryniak, D., Spohr, K. M., Steppenbeck, D., Tabor, S. L., Tripathi, V., Utsuno, Y., ... Zhu, S. (2010). Cross-shell excitations near the 'Island of Inversion': structure of $^30Mg$. Physical Review C, 82(3), [034305]. https://doi.org/10.1103/PhysRevC.82.034305